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This site holds four research summaries: CJC-1295 Ipamorelin, TB-500, Tesamorelin and PT-141. Each page shows the batch lot and HPLC purity, what the published research describes, the price per mg at each quantity and how to check the certificate for your vial.
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How the four compare
CJC-1295 / Ipamorelin, 10mg blend: $153, $15.30 per mg, 98.60% HPLC, lot CJI-260413-A.
TB-500, 10mg: $220, $22.00 per mg, 98.86% HPLC, lot TB5-260415-A.
Tesamorelin, 20mg: $170, $8.50 per mg, 98.74% HPLC, lot TES-260418-A.
PT-141 (bremelanotide), 10mg: $140, $14.00 per mg, 99.12% HPLC, lot PT1-260411-A.
What the comparison shows
Per milligram, tesamorelin is the lowest of the four at $8.50 because its vial holds twice the material; TB-500 is the highest at $22.00.
All four lots test between 98.60% and 99.12% by HPLC, so purity alone does not separate them; the lot number does, because it ties a vial to one certificate.
The evidence behind them differs more than the price. Tesamorelin and PT-141 each have controlled human trials (Falutz et al., N Engl J Med 2007, PMID 18057338 https://pubmed.ncbi.nlm.nih.gov/18057338/ ; Kingsberg et al., Obstet Gynecol 2019, PMID 31599840 https://pubmed.ncbi.nlm.nih.gov/31599840/ ). TB-500 rests mostly on animal models of its parent protein, and no trial has measured CJC-1295 and ipamorelin together.
None of the four is in the 2 to 3 day US warehouse range, so US orders take 5 to 10 business days.